From the Super Mario Wiki
The Forest Maze is a labyrinth of trees and underground passages found in the game Super Mario RPG: Legend of the Seven Stars. It includes some underground caverns accessed by traveling down tree stumps as well as some regular forested areas, but the main part is a maze infested with unlimited enemies. Also scattered throughout the forest are Mushrooms that the player can collect.
After Gaz's Geno doll is possessed by the Star Spirit ♡♪!?, he walks out of Rose Town and into the Forest Maze. Mario and Mallow, upon hearing this from Gaz, give chase to the doll. They eventually arrive at a a part of the forest that is taken over by Bowyer, a bow-like creature that is shooting Aeros at Rose Town. While Mario and Mallow spy on Bowyer, an Aero arrives and presents Bowyer with one of the Star Pieces. However, it is at this moment that Geno shows up, and attempts to fight Bowyer. With help from Mario and Mallow, Geno is able to defeat Bowyer and claim the second Star Piece. Afterward, Geno decides to join Mallow and Mario in claiming the remaining Star Pieces to repair Star Road.
The music of the Forest Maze is famous among players of the game, and was chosen as track four in the arranged version of the Super Mario RPG soundtrack. Only five tracks were included. In the music, many birds may be heard chirping. On both soundtracks, the music was titled "Beware the Forest's Mushrooms!"
Hackers were able to find a removed song in the data of Super Smash Bros. Brawl. The song was referenced as "snd_bgm_A12_MORINOKINOKO" (Mori no Kinoko, or "Mushrooms of the Forest"), which may be a reference to this music. If so, it was most likely removed due to copyright issues with Square-Enix.
A few notes of the track can be heard in the Toad Town and Peach's Castle themes in Mario & Luigi: Bowser's Inside Story. Being that Yoko Shimomura is responsible both for Super Mario RPG's music and the music in the Mario & Luigi series music, it is possible that this is intentional.
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